Compact or traditional crankset? The Centaur front derailleur can handle both solutions with no indecision. The M-Brace design of the front derailleur body & the inner arm in Z-Shape (TM) configuration ensure an unprecedented rigidity that translates into excellent shifting precision & speed. for double standard & Ct (tm) crankset capacity 16t difference max. chainring 55t min. chainring 34t chrome-plated nickel fork anti-friction insert M-brace (TM) body Even-O (TM) clamp Z-shape (TM) lower cage Features & Benefits Z-shape (tm) Inner Cage: maximum cage force & strength when shifting Derailleur Body With Exclusive Campagnolo (r) M-brace (tm) Geometry: high system rigidity & shifting precision Outer Cage Anti-friction Treatment: reduces friction & extends components' life